The Marine Corps’ most decorated regiment got a new leader Tuesday when Col. Roger Turner relinquished command of the “Fighting Fifth” to Col. Jason Bohm at Camp Pendleton.

Bohm, former director of the Marine Corps Liaison Office in the U.S. House of Representatives, took charge of the Fifth Marine Regiment during a ceremony on the Camp San Mateo helicopter landing zone.

Among other Camp Pendleton leadership changes: On Thursday, Col. Scott Campbell is slated to relinquish command of the 15th Marine Expeditionary Unit to Lt. Col. John O'Neal. The unit returned in May from an eight-month ship tour of the Western Pacific, Middle East and Africa aboard Amphibious Squadron 3.

Turner, who led the 5th Marine Regiment to war in Afghanistan in 2011, has been named the next military secretary to the commandant of the Marine Corps, Gen. James Amos. He joined the Marine Corps in 1984 and later commanded Marine Corps Recruiting Station Sacramento, when it was named Western Recruiting Region Station of the Year in 2001 and 2003.

Turner also commanded the 3rd battalion, 7th Marine Regiment from 2005 to 2007, when it deployed twice to Ramadi, Iraq. He is a veteran of Operation Desert Storm during the first Gulf War, has a master’s degree in national security and strategic studies from the Naval War College, and has served on the Joint Staff.

Bohm was commissioned in 1990 and served three tours during Operation Iraqi Freedom, including one in command of the 1st Battalion, 4th Marines from Camp Pendleton. He has a master’s degree in national security studies from the National War College and served on the Joint Staff.

The unit now under his command was activated in 1917 for deployment in World War I to France, where it fought in the ferocious Battle of Belleau Wood. More recently, the Fifth Marines and the regiment's four infantry battalions made significant contributions to the wars in Iraq and Afghanistan.

In March 2003, the regiment’s combat team was the first unit to cross the line of departure for the invasion of Iraq. Under the command of then-Col. Joe Dunford, the four-star general now in charge of the war in Afghanistan, the Fifth Marines seized the Rumayllah oilfields and helped topple the Iraqi regime.

During a yearlong tour in Afghanistan that began in August 2011, Turner and the regiment conducted counterinsurgency operations in central and southern Helmand province, in Marjah, Garmsir, Khan-Neshin and Nawa.

The regiment dedicated a memorial at Camp Pendleton this month to the 89 men who died with the unit in the Afghanistan War.

Roughly 5,000 Marines and sailors from the 5th Marine Regiment served in Operation Enduring Freedom, said Capt. Alex Lim, a former spokesman for the 1st Marine Division.

The new monument to the war dead from Afghanistan faces a similar one in the regiment’s memorial garden for more than 200 troops killed in the Iraq War.